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17 terms

A&P 101 Exam 3

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Reflx Arc
Reflexes occur over neural pathways called reflx arc; Flexor, planar, stretch (knee jerk), abdominal
How many pairs of periphereal nerves come out from spinal chord?
31 pairs; made up of efferent, afferent, motor, and mixed erves from receptor sites to effector sites
Antagonist substances can bind with neurotransmiter recetpr site to inhibit what?
neurotransmitter actions
Transduction
The change in stimulus information at receptor as becomes a nerve impulse
Sacral
Largest and thickest plexus area
Phrenic Nerve
one of a pair of nerves that arises from cervical spinal roots and passes down the thorax to innervate the diaphragm and control breathing; Use to Major visceral organs of general body trunk
Proprioreceptors
transduce signal of position of body parts
Interoreceptors
sensory cells that detect internal stimuli
Photoreceptors
The light-sensitive cells in the retina- the rods and cones.
Exteroreceptors
sensory cells that detect external stimuli
Mechanoreceptors
A sensory receptor that responds to mechanical disturbances, such as shape changes (being squashed, bent, pulled, etc.). Mechanoreceptors include touch receptors in the skin, hair cells, in the ear, muscle spindles, and others.
Nocireceptors
Sensory receptors which respond to pain or excess stimulation.
Meissners corpuscles
where tactile sensitives are well developed, live in hairless regions, sensitive to (light,touch), upper part of dermis
Pancinian corpuscles
pressure nerves found in the dermis reticular region
Bell's palsy
an injury or infection to the facial nerves, which then becomes inflamed, shows as paralysis of facial muscles, loss of taste, difficulty chewing and the affected eye may remain open all the time (effects may be permanent)
Neurofibromatosis
condition that causes tumors to grow on nerve tissue, producing skin and bone abnormalities
Polio
an acute viral disease marked by inflammation of nerve cells of the brain stem and spinal cord